I found a car online that I wanted to buy but was ...

I found a car online that I wanted to buy but was told I couldn t unless I used their more expensive lender. We are approved through our credit union that just needs a purchase order to send all funds. Sounds very shady that they won t sell the car to someone with good credit and confirmed funds. They would rather charge you higher interest rates to sell the car. Is that even legal to advertise a car online at a price and then not honor that unless you need to use their bar credit lenders?????